<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th>
            <input type="checkbox" v-model="all" />
            <span>全选</span>
          </th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <kingHonor :list="goodList" @newList="newList" />
      <tfoot>
        <tr>
          <td>合计:</td>
          <td colspan="5">{{ getSum }}</td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
import king from "./components/king.vue";
export default {
  components: {
    kingHonor: king,
  },
  data() {
    return {
      goodList: [
        {
          name: "诸葛亮",
          price: 1000,
          num: 1,
          checked: false,
        },
        {
          name: "蔡文姬",
          price: 1500,
          num: 1,
          checked: false,
        },
        {
          name: "妲己",
          price: 2000,
          num: 1,
          checked: false,
        },
        {
          name: "鲁班",
          price: 2200,
          num: 1,
          checked: false,
        },
      ],
    };
  },
  methods: {
    newList(arr) {
      this.goodList = arr;
    },
  },
  computed: {
    all: {
      set(val) {
        this.goodList.forEach((item) => (item.checked = val));
      },
      get() {
        return this.goodList.every((item) => item.checked);
      },
    },
    getSum() {
      let arr = this.goodList.filter((item) => item.checked == true);
      return arr.reduce((sum, item) => sum + item.price * item.num, 0);
    },
  },
};
</script>

<style></style>
